class ReferenceCategory():
    """
    引用类别枚举类
    """

    SECURITY = 'Security'
    PACKAGE_MANAGER = 'Package-Manager'
    PERSISTENT_ID = 'Persistent-Id'
    OTHER = 'Other'


class RelationshipType():
    """
    关系类别枚举类
    """
    
    SELF_DESCRIBES = 'DESCRIBES'
    DEPENDS_ON = 'DEPENDS_ON'
    CONTAINS = 'CONTAINS'